Nerve decompression surgery

What is nerve decompression?

Nerves in the foot and ankle travel through narrow spaces bounded by bone, ligament, fascia and muscle. When a nerve is squeezed or tethered in one of those spaces, it can cause burning, tingling, numbness or shooting pain in the area it supplies. Decompression surgery opens the tissue that is pressing on the nerve — for example the flexor retinaculum over the tarsal tunnel — and removes anything else compressing it, such as a cyst, a bone spur or scar tissue.^[1,2]

Conditions it may be used for

• Tarsal tunnel syndrome — release of the tibial nerve behind the inner ankle and, when needed, the branches that continue into the sole. See tarsal tunnel syndrome.
• Baxter’s nerve entrapment — release of the first branch of the lateral plantar nerve beneath the heel, sometimes combined with a partial release of the plantar fascia. See Baxter’s nerve entrapment.
• Other entrapments — for example the deep or superficial peroneal nerves on the top and front of the ankle, or the sural nerve on the outer side. See nerve entrapment in the foot and ankle.
• Selected cases of Morton’s neuroma — release of the ligament over the nerve rather than removal of the nerve. See neuroma treatment.

Who may be a candidate

Decompression may be discussed when:

• symptoms have persisted and affect daily life despite a well-tried course of non-surgical care — usually several months of footwear changes, orthotics or bracing, activity changes, therapy and medication
• the examination points to a specific nerve at a specific place, supported where helpful by imaging and by nerve studies arranged with another specialist
• a structure such as a cyst is clearly pressing on the nerve, which can make earlier surgery reasonable
• the expected benefit outweighs the risks for you, taking into account factors such as blood-sugar control, smoking and circulation

In one study of tarsal tunnel syndrome, people whose symptoms persisted despite non-surgical treatment had significant pain improvement after surgery in the heel and inner-sole regions, but not in the outer-sole region — a reminder that results are not uniform.^[5] Overall, research on how best to manage nerve entrapment in the foot is limited.^[3]

Decompression and diabetic neuropathy

You may see nerve decompression promoted as a treatment for diabetic peripheral neuropathy. The American Academy of Neurology has described decompression for diabetic neuropathy as unproven, and a Cochrane review found no well-designed trials showing benefit in symmetrical diabetic neuropathy.^[6,7] A 2022 meta-analysis of mostly observational studies reported less pain and fewer ulcers after decompression, but in the randomized trials it included the improvements were not statistically significant, and the authors called for high-quality trials.^[8]

For that reason, decompression is not offered as a treatment for neuropathy itself. When someone with neuropathy also has clear signs of a specific nerve entrapment — such as tarsal tunnel syndrome — that entrapment is evaluated on its own merits, with a frank discussion of what the evidence does and doesn’t show. Learn more about peripheral neuropathy evaluation.

What the operation involves

• Where: at a hospital or ambulatory surgery center where Dr. Ozturk has privileges. Most people go home the same day.
• Anesthesia: chosen with the anesthesia team — often a regional nerve block with sedation, or a general anesthetic.
• The procedure: an incision is made along the course of the nerve; the tight band or tissue over it is released; the nerve and its branches are freed and checked; and any cyst, spur or scar compressing it is removed.
• Afterward: the incision is closed and a padded dressing, and sometimes a splint or boot, is applied.

Recovery

• First weeks: keep the foot elevated to limit swelling, keep the dressing dry, and follow the weight-bearing plan you are given. Stitches are usually removed after about two weeks.
• Return to shoes and activity: gradual, over several weeks, guided by wound healing and comfort. Physical therapy may help with swelling, scar mobility and strength.
• Nerve symptoms: improve gradually. Pain often eases before numbness does, and recovery can continue for many months. Some symptoms may remain.

Risks

All surgery carries risk. Risks discussed before decompression include infection; wound-healing problems (the skin on the inner ankle can be slow to heal); a thickened or sensitive scar; bleeding or blood clots; injury to a nerve or blood vessel; persistent or recurrent symptoms; and, rarely, complex regional pain syndrome. If symptoms persist, further surgery is more complex — see revision nerve surgery.

Questions to ask before deciding

• Which nerve is involved, where exactly is it compressed, and how sure are we?
• What non-surgical treatment have I tried, and for how long?
• What result is realistic for me — for pain, numbness and walking?
• What happens if I wait, or choose not to have surgery?
• What will recovery mean for my work, driving and exercise?

When to seek care